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1, Redis overview Redis is an open source high-performance memory based key value pair NoSQL database developed in C language. Compared with the relational database that must be stored according to the specified format, the data format of non relational database is more flexible, which is usually used to check the storage of large-scale da ...

brief introduction Python is a very simple language. Python is an interpretive language that uses indentation alignment to organize code execution. 1, 6 standard data types: Number String List Tuple Sets Dictionary Where, Number String Tuple Sets is immutable data List Dictionart is variable data 2. Basic grammar: Operat ...

1, What is a computer It is widely used in scientific computing, data processing, automatic control, computer aided design, artificial intelligence and network fieldsIt consists of hardware and software 2, Computer hardware Composition of computer hardware: CPU, memory, motherboard, IO device and graphics card 3, Von Neumann architecture V ...

File operation 1. Text file The text file stores ordinary "character" text. The default is unicode character set (two bytes represent one character, up to 65536), which can be opened by Notepad program. However, documents edited by word software are not text files. 2. Binary files Binary files store the data content in "bytes&quo ...

Java_ Select and loop statements 1. Select statement – switch (1) Statement format: switch (expression) { case Constant value 1: Statement body 1; break; case Constant value 2: Statement body 2; break; .... default: Statement body n+1; break; } (2) Flow chart: (3) ...

C++ primer Chapter 13 review 13.1 copy, assignment and destruction Class has five special member functions that control object copy, movement, assignment and destruction copy constructor copy assignment operator move constructor Move assignment operatorDestructor The above operations are called copy control operations. If a class does not d ...

1, Keywords and identifiers 1. Use of java keywords Definition: a string (word) with special meaning given by the Java language for special purposes Features: all letters in the keyword are lowercase Specific keywords: 2. Reserved word The current Java version has not been used, but later versions may be used as keywords. What are th ...

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1. Definition of variables No matter which high-level language is used, variables are the basic unit of the program. Variable means that in memory, the program can apply for a piece of data storage space by defining a variable, and then use this storage space by referencing the variable name. 2. Steps for using variables Declare variableInit ...

Chapter III list introduction What is the list A list consists of a series of elements arranged in a specific order. There is no relationship between multiple elements. A list usually contains multiple elements. Therefore, assign a name representing a plural number to the list (such as letters, digits, or names). In python, the list is repre ...